Answer :
chloroplast is the part whose main job is to use energy from sunlight to make sugar in a plant cell.
A plastid or chloroplast is a membrane-bound organelle that primarily performs photosynthesis in plant and algal cells. While releasing oxygen from water in the cells, the photosynthetic pigment chlorophyll absorbs energy from sunlight, transforms it, and stores it in the energy-storage molecules ATP and NADPH. The Calvin cycle is the mechanism by which organic molecules are produced from carbon dioxide using ATP and NADPH. Other tasks performed by chloroplasts in plants include the synthesis of fatty acids, amino acids, and the immunological response.
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